By Staff Writer (staff@latinospost.com) | First Posted: Jan 17, 2014 03:55 AM EST

Rupert Grint and Shia LaBeouf co-star in "The Necessary Death of Charlie Countryman", but the experience was more eye-opening to the former "Harry Potter" star than he thought, owing to the fact that he had to watch his co-star rampage on set.

While filming for the movie, the retired/unretired actor, LaBeouf, apparently dropped acid in front of the cast and crew, to find the deepest, darkest level of his character.

Grint told The Guardian, "He [LaBeouf] smashed the place up, got naked and kept seeing this owl. If anything will make you not do drugs, it's watching that."

Unfortunately for LaBeouf, he didn't have to go through that trip, because according to Huffington Post, film director Fredrik Bond said, "In the script, it's Carpathian ecstasy, a special hostel ecstasy that exists in maybe just Bucharest."

He added, "So, Shia said he took acid? I didn't know he went out and said that. But it was always ecstasy in the script."

Dropping acid is LaBeouf's idea to "go out on a limb and push the envelope. The "Transformers" star has previously spoken of his interest in method acting, and he seems to be doing so with the acid trip for "Charlie Countryman."

He said, "There's a way to do an acid trip like 'Harold & Kumar,' and there's a way to be on acid. What I know of acting, Sean Penn actually strapped up to that (electric) chair in 'Dead Man Walking.' These are the guys that I look up to."

In an interview with MTV News, LaBeouf explained why he took LSD in the first place, saying that "I was getting really nervous toward the end. Not because I wanted to be on drugs -- I'm not trying to mess with the set or anything like that. It's really just fear that propels people."

"The Necessary Death of Charlie Countryman" will premiere in the U.K. on February 14, but will be released at a much later date in the U.S., in November.

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